Oled touch display panel and touch display device

ABSTRACT

An OLED touch display panel and a touch display device are disclosed. The OLED touch display panel includes a TFT back plate and a cathode layer disposed on the TFT back plate. The cathode layer includes a plurality of touch leads which are insulated from each other and a plurality of self-capacitance electrodes which are insulated from each other and arranged in a form of a matrix. The touch leads extend to a non-display region of the OLED touch display panel. Each one of the touch leads is connected with one of the self-capacitance electrodes, and resistance values of the touch leads connected with the self-capacitance electrodes of a same row are all consistent.

RELATED APPLICATION

The present application is the U.S. national phase entry ofPCT/CN2018/070077, with an international filing date of Jan. 3, 2018,which claims the priority right of Chinese patent application No.201710328879.6 filed on May 10, 2017, the entire content of which areincorporated herein by reference.

TECHNICAL FIELD

This disclosure relates to the field of display technology, particularlyto an OLED touch display panel and a touch display device.

BACKGROUND

Active matrix organic light emitting diode (AMOLED) displays haveadvantages of low manufacturing costs, fast response speed, low powerconsumption, DC drive applicable to portable devices, and a large rangeof operation temperatures, etc., and hence are expected to be the nextgeneration of new type flat displays replacing liquid crystal displays(LCDs). In particular, flexible AMOLEDs are attracting more and moreattention on the market since they are light, thin, bendable orcollapsible, and arbitrarily variable in shape.

An AMOLED usually needs an encapsulation cover plate as a barrier towater and oxygen. The encapsulation cover plate is manufactured normallythrough a glass cover plate process or a thin film encapsulation (TFE)process. When adopting the TFE process, normally, a Multi-Layer-On-Celltouch structure is directly manufactured on a thin film encapsulationstructure, which, for example, has been adopted in a cell phone ofGalaxy S6 made by Samsung. However, the Multi-Layer-On-Cell touchstructure involves complicated manufacture processes and higher costs.

SUMMARY

One aspect of embodiments of this disclosure provides an OLED touchdisplay panel, comprising a TFT back plate and a cathode layer disposedon the TFT back plate. The cathode layer comprises a plurality of touchleads which are insulated from each other and a plurality ofself-capacitance electrodes which are insulated from each other andarranged in a form of matrix. The touch leads extend to a non-displayregion of the OLED touch display panel. Each one of the touch leads isconnected with one of the self-capacitance electrodes, and resistancevalues of the touch leads connected with the self-capacitance electrodesof a same row are all consistent.

In an embodiment, in a left half part of the OLED touch display panel,from left to right, widths of touch leads connected withself-capacitance electrodes of a first column are the same as widths oftouch leads connected with self-capacitance electrodes of a secondcolumn, and lengths of the touch leads connected with theself-capacitance electrodes of the first column are the same as lengthsof the touch leads connected with the self-capacitance electrodes of thesecond column. Except for the self-capacitance electrodes of the firstcolumn, lengths and widths of touch leads connected withself-capacitance electrodes of other columns increase successively. In aright half part of the OLED touch display panel, from right to left,widths of touch leads connected with self-capacitance electrodes of afirst column are the same as widths of touch leads connected withself-capacitance electrodes of a second column, and lengths of the touchleads connected with the self-capacitance electrodes of the first columnare the same as lengths of the touch leads connected with theself-capacitance electrodes of the second column. Except for theself-capacitance electrodes of the first column, lengths and widths oftouch leads connected with the self-capacitance electrodes of othercolumns increase successively.

In an embodiment, the self-capacitance electrode is in a rectangularshape. In a left half part of the OLED touch display panel, from left toright, areas of the self-capacitance electrode increases gradually. In aright half part of the OLED touch display panel, from right to left of,areas of the self-capacitance electrode increases gradually.

In an embodiment, in any one of the left half part or the right halfpart of the OLED touch display panel, a sum of widths of touch leadsconnected with self-capacitance electrodes of a same row is less than orequal to 10% of a width of a self-capacitance electrode with the largestarea in the same row. Width directions of the touch lead and widthdirections of the self-capacitance electrodes are both perpendicular toextending directions of the touch leads.

In an embodiment, in the left half part of the OLED touch display panel,from left to right, the widths of touch leads connected with theself-capacitance electrodes of the first column and the second column isthe same as a width of a sub-pixel of the OLED touch display panel.

In an embodiment, in the right half part of the OLED touch displaypanel, from right to left, the widths of the touch leads connected withthe self-capacitance electrodes of the first column and the secondcolumn is the same as a width of a sub-pixel of the OLED touch displaypanel.

In an embodiment, the OLED touch display panel further comprises aplurality of L-shape baffles disposed on the TFT back plate and aplurality of strip-shape baffles parallel to a horizontal edge of theL-shape baffle. In a left half part of the OLED touch display panel,from left to right, sizes of the plurality of L-shape baffles increasesuccessively, or in a right half part of the OLED touch display panel,from right to left, sizes of the plurality of L-shape baffles increasesuccessively.

In an embodiment, vertical edges of two adjacent L-shape baffles arerespectively connected with two ends of one of the strip-shape baffles.The vertical edges of the two adjacent L-shape baffles and the one ofthe strip-shape baffles define a touch region, and the horizontal edgesof the two adjacent L-shape baffles define a lead region connected withthe touch region.

In an embodiment, the L-shape baffle and the strip-shape bafflepartition the cathode layer into the self-capacitance electrode locatedwithin the touch region and the touch leads located within the leadregion.

In an embodiment, in the left half part of the OLED touch display panel,from left to right, or in the right half part of the OLED touch displaypanel, from right to left, opening directions of two adjacent L-shapebaffles for defining the touch regions of the first column are arrangedoppositely, and opening directions of two adjacent L-shape baffles ofother columns are the same.

In an embodiment, except for the touch regions of the first row, ahorizontal edge of an inner-most L-shape baffle in a row for defining atouch region of a previous row is shared by a strip-shape baffle fordefining a touch region of a next row.

In an embodiment, the OLED touch display panel further comprises a pixeldefinition layer disposed on the TFT back plate. The pixel definitionlayer comprises pixel partitions crossing each other transversely andlongitudinally, and an opening enclosed by the pixel partitions. TheL-shape baffle and the strip-shape baffle are located on a side of thepixel partition away from the TFT back plate.

In an embodiment, shapes of longitudinal sections of the L-shape baffleand the strip-shape baffle are inverted trapezoids, and the longitudinalsections are perpendicular to the TFT back plate.

In an embodiment, the OLED touch display panel further comprises spacerswithin the touch region disposed on the TFT back plate. The L-shapebaffle and the strip-shape baffle are in a same layer with the spacersand have a same material with the spacers, and the L-shape baffle andthe strip-shape baffle are made of negative photoresist.

In an embodiment, the spacers comprise a plurality of first sub-spacersand a plurality of second sub-spacers. The plurality of firstsub-spacers are arranged in a form of a matrix, and the secondsub-spacers are located between two adjacent rows and two adjacentcolumns of first sub-spacers. An extending direction of the firstsub-spacer is perpendicular to an extending direction of the secondsub-spacer.

In an embodiment, the OLED touch display panel further comprises anorganic material functional layer. The organic material functional layercomprises a hole injection layer, a hole transport layer, a paddinglayer, a buffer layer, an organic light emitting layer and an electrontransport layer successively located on a side of the TFT back plateclose to the cathode layer. The hole injection layer, the hole transportlayer, the buffer layer and the electron transport layer completelycover a display region of the TFT back plate. The organic light emittinglayer and the padding layer correspond to positions of the openings.

In an embodiment, the OLED touch display panel further comprises anorganic material functional layer. The organic material functional layercomprising a hole injection layer, a hole transport layer, a paddinglayer, a buffer layer, an organic light emitting layer and an electrontransport layer successively located on a side of the TFT back plateclose to the cathode layer and corresponding to positions of theopenings.

In an embodiment, the cathode layer comprises at least one of metallicmagnesium and metallic silver.

The other aspect of embodiments of this disclosure provides a touchdisplay device, comprising an OLED touch display panel as stated in anyof the above embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to illustrate the technical solutions in the embodiments ofthis disclosure more clearly, drawings to be used in description of theembodiments of this disclosure will be briefly introduced below. Thedrawings in the descriptions below are only some embodiments of thisdisclosure. For a person having ordinary skills in the art, otherdrawings can be further obtained from these drawings without anyinventive efforts.

FIG. 1 is a schematic view of a structure of an OLED touch display panelprovided by an embodiment of this disclosure;

FIG. 2 is a schematic view of a multiplexing structure of the cathodelayer in FIG. 1 and the self-capacitance electrode;

FIG. 3A is a schematic view of a connection structure of the touch leadsas shown in FIG. 2 in a non-display region;

FIG. 3B is a schematic view of a specific connection structure of themetal film layer and the touch lead as shown in FIG. 3A in a non-displayregion;

FIG. 4 is a schematic view of a known on-cell touch structure;

FIG. 5 is a schematic view of arrangement structure of theself-capacitance electrode in FIG. 1 and the touch lead;

FIG. 6 is a schematic view of structure of an OLED touch display panelprovided with L-shape baffles;

FIG. 7 is a schematic view of a plurality of touch regions defined bythe L-shape baffles in FIG. 6 and the stripe-shape baffles;

FIG. 8 is a schematic view of a structure of a touch region of the firstcolumn in FIG. 7;

FIG. 9 is a schematic view of a structure of a touch region of columnsother than the first column in FIG. 7;

FIG. 10 is a schematic view of structures of self-capacitance electrodesand touch leads partitioned by the L-shape baffles and the strip-shapebaffles as shown in FIG. 7;

FIG. 11 is a schematic view of spacers disposed in the touch regionsdefined by the L-shape baffles and the strip-shape baffles as shown inFIG. 10;

FIG. 12 is a schematic view of distribution of the spacers in FIG. 11;

FIG. 13 is a schematic view of a structure of an organic materialfunctional layer provided by the present application; and

FIG. 14 is another schematic view of a structure of an organic materialfunctional layer provided by the present application.

DETAILED DESCRIPTION

The technical solutions in the embodiments of this disclosure shall bedescribed clearly and completely as follows with reference to thedrawings in the embodiments of this disclosure. Obviously, the describedembodiments are only part of the embodiments of this disclosure, insteadof all. Based on the embodiments in this disclosure, all otherembodiments obtainable by a person having ordinary skills in the artwithout any inventive efforts shall fall within the protection scope ofthis disclosure.

Reference signs: 10—TFT back plate; 20—cathode layer;201—self-capacitance electrode; 202—touch lead; 11—L-shape baffle;11′—strip-shape baffle; 101—touch region; 102—lead region; 110 a—firstsub-spacer; 110 b—second sub-spacer; 110—spacer; 13—metal film layer;14—touch IC; 15—encapsulation cover plate; 16—multilayer touchstructure; 17—display driving chip; A—display region of the OLED touchdisplay panel; B—non-display region of the OLED touch display panel;30—pixel definition layer; 301—pixel partition; 302—opening; 401—holeinjection layer; 402—hole transport layer; 403—organic light emittinglayer; 404—electron transport layer; 405—padding layer; 406—bufferlayer; 407—capping layer.

An embodiment of this disclosure provides an OLED touch display panel,as shown in FIG. 1, comprising a TFT back plate 10 and a cathode layer20 disposed on the TFT back plate 10.

The cathode layer 20 as shown in FIG. 2 comprises a plurality of touchleads 202 which are insulated from each other and a plurality ofself-capacitance electrodes 201 which are insulated from each other andarranged in a form of a matrix. The touch leads 202 extend to anon-display region B of the OLED touch display panel.

Each touch lead 202 is connected with one self-capacitance electrode201, and resistance values of the touch leads 202 connected with theself-capacitance electrodes 201 of a same row are all consistent.

It should be noted that the word “consistent” in the above expression“resistance values of the touch leads 202 connected with theself-capacitance electrodes 201 of a same row are all consistent” meansthat, in a range allowed by design and manufacture tolerances, theresistance values of the touch leads 202 connected with theself-capacitance electrodes 201 of a same row are same or approximatelysame. Specifically, the range may be 90%-100%, meaning that, in the samerow, the resistance value of a first self-capacitance electrode is90%-100% of that of a second self-capacitance electrode. For example, inthe same row, the resistance value of the first self-capacitanceelectrode is 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100%, etc.,of that of a second self-capacitance electrode.

In addition, in order to save the wiring space and simplify the wiringprocess, for example, the plurality of touch leads 202 connected withself-capacitance electrodes 201 of the same row are arranged parallel toeach other. In such a case, the extending direction of “row (R)” in theabove expression “self-capacitance electrodes 201 of the same row” issame as the extending direction of the plurality of touch leads 202connected with the self-capacitance electrodes 201 of this row.

From the above it can be seen that, on the one hand, since the cathodelayer 20 comprises a plurality of self-capacitance electrodes 201 whichare insulated from each other and arranged in a form of matrix, thecathode layer 20 can be used as the self-capacitance electrodes 201.That is, when the OLED touch display panel is in a display stage, avoltage is applied to the cathode layer 20, so that the cathode layer 20forms an electric field with the anode on the TFT back plate 10, therebyexciting the organic light emitting layer located between the cathodelayer 20 and the anode in the OLED touch display panel to emit light.When the OLED touch display panel is in the touch stage, each of theself-capacitance electrodes 201 can be electrically connected with ametal film layer 13 in the non-display region B as shown in FIG. 3Athrough the touch lead 202 connected with it. Specifically, as shown inFIG. 3B, the touch lead 202 is electrically connected with the metalfilm layer 13 through a transparent conductive film layer (e.g., the ITOas shown in FIG. 3B, the transparent conductive film layer is formed bysuch as indium tin oxide). The metal film layer 13 is further connectedwith the ground end (GND) or a low voltage end (VSS), so as to enablethe self-capacitance electrode 201 to constitute self-capacitance withthe ground end or the low voltage end. Moreover, when the plurality ofself-capacitance electrodes 201 are arranged in a form of a matrix, theself-capacitance electrodes 201 of N rows and M columns can be scanned(i.e., performing scanning for N+M times), so as to determine the touchposition based on the coordinates of the self-capacitance whosecapacitance value changes. In this way, an in-cell touch structure witha simple structure as shown in FIG. 3A can be realized by multiplexingthe cathode layer 20 with the self-capacitance electrode 201. Therefore,there is no need to adopt the scheme of arranging a multilayer touchstructure 16 on the outer side of the encapsulation cover plate 15 asshown in FIG. 4, hence, the structure of the OLED touch display panel issimplified. The above N and M are positive integers greater than orequal to 2.

On the other hand, the metal film layer 13 in FIG. 3A, connects not onlywith the ground end or the low voltage end of the non-display region B,but also with a touch IC 14 in the non-display region B on the FPC, tooutput the signal collected by the touch lead 202 to the touch IC 14. Insuch a case, since the resistance values of the touch leads 202connected with the self-capacitance electrodes 201 of the same row areall consistent, the resistance values of the touch leads 202 per seconnected with the self-capacitance electrodes 201 of the same row havethe same influence to the signal inputted by each touch lead 202 to theself-capacitance electrode 201 connected therewith and to the collectedsignal outputted to the touch IC 14. Thus, by performing an equalresistance design to the touch leads 202, the influence of the IR-dropphenomenon caused by lead resistance difference on the display and touchperformance of the OLED touch display panel can be reduced.

In yet another aspect, if the material of the cathode layer 20 is ametallic material such as at least one of metallic magnesium (Mg) andmetallic silver (Ag), since metals have good ductility, when the OLEDtouch display panel is applied to the field of flexible display, abetter bending effect can be achieved, thereby solving the defect thatin case a multi-layer thin film On Cell touch structure is used, itcannot satisfy the requirement of bendability for the electrode insideit is made of transparent conductive materials.

On this basis, in order to enable the consistency of the resistancevalues of the touch leads 202 connected with the self-capacitanceelectrodes 201 of the same row, the setting manners of theself-capacitance electrode 201 and the touch lead 202 will be explainedbelow.

Specifically, as shown in FIG. 5, in order to enable the plurality oftouch leads 202 connected with the self-capacitance electrodes 201 ofthe same row to have enough wiring space, for example, the displayregion A of the OLED touch display panel is divided into left halfscreen and right half screen. In the left half screen, the plurality oftouch leads 202 connected with the self-capacitance electrodes 201 ofthe same row extend to the non-display region B at the left half part ofthe OLED touch display panel. In the right half screen, the plurality oftouch leads 202 connected with the self-capacitance electrodes 201 ofthe same row extend to the non-display region B at the right half partof the OLED touch display panel.

It should be noted that the position terms such as “left” and “right” inthe present application are defined relative to the arranged orientationof the OLED touch display panel shown in the drawings. It should beunderstood that these directional terms are concepts of relativity, andthey are used for description and clarification of relativity which canbe changed correspondingly based on the change of the position of theOLED touch display panel.

On the basis of this, from left to right of the left half part of theOLED touch display panel, it is arranged the first column C1 ofself-capacitance electrodes and the second column C2 of self-capacitanceelectrodes. The widths W of the touch leads 202 connected withself-capacitance electrodes 201 of a first column C1 are the same as thewidths W of the touch leads 202 connected with self-capacitanceelectrodes 201 of a second column C2, and the lengths L of the touchleads 202 connected with the self-capacitance electrodes 201 of thefirst column C1 are the same as the lengths L of the touch leads 202connected with the self-capacitance electrodes 201 of the second columnC2. In addition, in every row of the self-capacitance electrodes, exceptfrom the self-capacitance electrodes 201 of the first column C1, lengthsL and widths W of touch leads 202 connected with other self-capacitanceelectrodes of the row increase successively.

In addition, from right to left of the right half part of the OLED touchdisplay panel, it is arranged the first column C1′ of self-capacitanceelectrodes and the second column C2′ of self-capacitance electrodes. Thewidths W of the touch leads 202 connected with self-capacitanceelectrodes 201 of a first column C1′ are the same as the touch leads 202connected with self-capacitance electrodes 201 of a second column C2′,and the lengths L of the touch leads 202 connected with theself-capacitance electrodes 201 of the first column C1′ are the same asthe lengths L of the touch leads 202 connected with the self-capacitanceelectrodes 201 of the second column C2′. In addition, in every row ofthe self-capacitance electrodes, except from the self-capacitanceelectrodes 201 of the first column C1′, lengths L and widths W of touchleads 202 connected with the other self-capacitance electrodes of therow increase successively.

From above, it can be seen that from left to right of the left half partof the OLED touch display panel or, from right to left of the right halfpart of the OLED touch display panel, the width W1 of the touch lead 202connected with the self-capacitance electrode 201 of the first column C1is same as the width W2 of the touch lead 202 connected with thecapacitive electrode 201 of the second column C2. The width of the touchlead 202 is the line width of the touch lead 202. Moreover, the lengthL1 of the touch lead 202 connected with the self-capacitance electrode201 of the first column C1 is same as the length L2 of the touch lead202 connected with the self-capacitance electrode 201 of the secondcolumn C2. The extending direction of the length of the touch lead 202is same as the extending direction of the self-capacitance electrodes201 of this row.

In addition, from left to right of the left half part of the OLED touchdisplay panel or, from right to left of the right half part of the OLEDtouch display panel, except for the self-capacitance electrodes 201 ofthe first columns C1 and C1′, the lengths L and the widths W of thetouch leads 202 connected with self-capacitance electrodes 201 of othercolumns respectively increase successively.

Specifically, take the three adjacent self-capacitance electrodes TX1,TX2 and TX3 in the first row in the left half part of the OLED touchdisplay panel as the example, the relation between the widths W1, W2 andW3 of three touch leads 202 connected with TX1, TX2 and TX3 respectivelyis: W1=W2=M×W3; wherein 0<M<1, and M is a positive number. For example,M can be 0.5.

In addition, the relation between the lengths L1, L2 and L3 of the threetouch leads 202 connected with TX1, TX2 and TX3 respectively is:L1=L2=M×L3.

In such a case, since the resistance value of the touch lead 202 is ininverse proportion to its width W and is in direct proportion to itslength L, when the lengths L and the widths W of the three touch leads202 connected with the self-capacitance electrodes TX1, TX2 and TX3respectively increase progressively, the resistance values of the threetouch lead 202 can keep the same or approximately the same, so as torealize equal resistance design. By doing this, the influence on thedisplay and touch performance of the OLED touch display panel by theIR-drop phenomenon caused by lead resistance difference can be reduced.

Certainly, the above illustration is only made with respect to thesetting manners of the lengths and the widths of the self-capacitanceelectrodes TX1, TX2 and TX3. When the left half part or the right halfpart of the OLED touch display panel comprises more than three columnsof self-capacitance electrodes 201, the lengths and the widths of thetouch leads 202 connected with the self-capacitance electrodes 201 ofthe same row increase with the increase of the number of the column ofthe self-capacitance electrodes 201 in the left half part or the righthalf part of the OLED touch display panel. For example, for either theleft half screen or the right half screen, the lengths and the widths ofthe plurality of touch leads 202 connected with the self-capacitanceelectrodes 201 of the same row increase gradually in the form of anarithmetic progression, so as to be easy to realize the equal resistancedesign.

In such a case, when the sum of the widths of all the touch leads 202connected with the self-capacitance electrodes 201 of the same row istoo large, in the touch process, the press position of the finger willcorrespond to the positions of a plurality of touch leads 202 ratherthan substantially correspond to the position of a certainself-capacitance electrode 201. Thus, which self-capacitance electrode201 has a position corresponding to the touch position could not bedetermined, thereby producing a touch blind zone and reducing the userexperience.

In order to solve the above problem, for example, in either the lefthalf part or the right half part of the OLED touch display panel, thesum of the widths of the touch leads 202 connected with theself-capacitance electrodes 201 of the same row is less than or equal to10% of the width of the self-capacitance electrode 201 having thelargest area in this row.

The width direction of the touch lead 202 and the width direction of theself-capacitance electrode 201 are both perpendicular to the extendingdirection of the touch lead 202.

In this way, the sum of the widths of all the touch leads 202 connectedwith the self-capacitance electrodes 201 of the same row can becontrolled effectively so as to enable any press position in the touchprocess to substantially correspond to the position of a certainself-capacitance electrode 201, thereby providing benefit for reducingthe touch blind zone and improving the touch precision.

On this basis, in order to further improve uniformity of the displaybrightness, in an embodiment, the self-capacitance electrodes 201 haverectangular shapes, e.g., square shapes. From left to right of the lefthalf part of the OLED touch display panel, the area of theself-capacitance electrode 201 increases gradually. In addition, fromright to left of the right half part of the OLED touch display panel,the area of the self-capacitance electrode 201 increases gradually. Inthis way, by progressively increasing the areas of the self-capacitanceelectrodes 201 in the left half screen and the right half screen of theOLED touch display panel from the left and right edges to the middle, inthe display process, when the plurality of self-capacitance electrodes201 are charged as the cathode layer 20, the amount of the chargedelectricity will also increase progressively. In such a case, a humaneye would not find the subtle difference in electricity between twoadjacent self-capacitance electrodes 201, thereby enabling the displaybrightness of the OLED touch display panel to keep uniform. Moreover, inthe process of performing multiple lighting effect tests to the OLEDtouch display panel, the applicant finds that, the brightness uniformityis good when the OLED touch display panel is displaying an image (e.g.,stripe image).

It should be noted that the resolution of the OLED touch display panelis not limited by the present application. after the resolution has beenincreased, the self-capacitance electrode 201 and the touch lead 202 canstill adopt the above setting manners. On this basis, when theresolution increases, in order to reduce the IR-drop phenomenon, thewiring space of the touch leads 202 connected with a part ofself-capacitance electrodes 201 close to the central position of theOLED touch display panel can be increased, in the left half screen orthe right half screen of the OLED touch display panel. In an embodiment,in the left half screen or the right half screen of the OLED touchdisplay panel, the widths of the touch leads 202 connected with theself-capacitance electrodes 201 of the first column C1 (or C1′) and thesecond column C2 (or C2′) should be as small as possible.

In order to achieve the above purpose, from left to right of the lefthalf part of the OLED touch display panel, the width of the touch leads202 connected with the self-capacitance electrodes 201 of the firstcolumn C1 and the second column C2 is same as the width of a sub-pixelof the OLED touch display panel.

Alternatively, from right to left of the right half part of the OLEDtouch display panel, the width of the touch leads 202 connected with theself-capacitance electrodes 201 of the first column C1′ and the secondcolumn C2′ is same as the width of a sub-pixel of the OLED touch displaypanel.

On the basis of this, in order to form the plurality of self-capacitanceelectrodes 201 that can be multiplexed with the cathode 20 and the touchleads 202 connected with the respective self-capacitance electrodes 201,in an embodiment, the OLED touch display panel further comprises aplurality of L-shape baffles as shown in FIG. 7 disposed on the TFT backplate 10 as shown in FIG. 6 and a plurality of strip-shape baffles 11′parallel to the horizontal edge of the L-shape baffle 11. In addition,from left to right of the left half part the sizes of the plurality ofL-shape baffles 11 increase successively, or from right to left of theright half part of the OLED touch display panel, the sizes of theplurality of L-shape baffles 11 increase successively.

Specifically, the vertical edges of two adjacent L-shape baffles 11 areconnected with one strip-shape baffle 11′ respectively. The verticaledges of the two adjacent L-shape baffles 11 and one strip-shape baffle11′ define a touch region 101. In addition, the horizontal edges of twoadjacent L-shape baffles define a lead region 102 connected with thetouch region 101.

Based on this, in an embodiment, from left to right of the left halfpart or from right to left of the right half part of the OLED touchdisplay panel, two adjacent L-shape baffles 11 defining the touchregions 101 of the first column C1 (or C1′) have arranged oppositelybending direction. FIG. 8 is a magnified schematic view of shape of atouch region 101 in the first column C1 (or C1′) in FIG. 7. In addition,the bending directions (i.e. the opening directions) of two adjacentL-shape baffles 11 of other columns are same. FIG. 9 is a magnifiedschematic view of shape of a touch region 101 in the second column C2(or C2′) or a column after the second column C2 (or C2′) in FIG. 7.

On this basis, except for the touch region of the first row, thehorizontal edge of the inner-most L-shape baffle 11 in a row fordefining the touch region 101 of a previous row is shared by astrip-shape baffle for defining a touch region of a next row.

It should be noted that the extending direction of the horizontal edgeof the L-shape baffle 11 is same as the extending direction of the touchlead 202. In addition, the extending direction of the vertical edge ofthe L-shape baffle 11 is perpendicular to the extending direction of thetouch lead 202.

In such a case, the L-shape baffle 11 and the strip-shape baffle 11′ areused for, as shown in FIG. 10, dividing the cathode layer 20 intoself-capacitance electrode 201 located in the touch region 101 and touchlead 202 located in the lead region 102.

To sum up, on the one hand, from left to right of the left half part orfrom right to left of the right half part of the OLED touch displaypanel, by increasing successively the sizes of a plurality of L-shapebaffles 11, and oppositely defining the bending directions of twoadjacent L-shape baffles 11 for defining the touch region 101 of thefirst column C1 (or C1′), and equally defining the opening directions oftwo adjacent L-shape baffles 11 of other columns, what is achieved isthat, in a plurality of self-capacitance electrodes 201 formed bypartitioning the cathode layer 20 by means of the L-shape baffles 11 andthe strip-shape baffles 11′, except the self-capacitance electrodes 201of the first column C1, the lengths L and the widths W of the touchleads 202 connected with the self-capacitance electrodes 201 of othercolumns increase successively, and the areas of the self-capacitanceelectrodes 201 of the left half screen and the right half screen of theOLED touch display panel increase progressively to the middle, therebyproviding benefit for realizing equal resistance design of the touchleads and improving uniformity of the display brightness.

In addition, on the other hand, the baffles can also support theencapsulation cover plate in the OLED touch display panel, such that thesurface of the OLED touch display panel is flat.

On this basis, in order to avoid influencing the display effect, forexample, the OLED touch display panel further comprises a pixeldefinition layer 30 disposed on the TFT back plate 10 as shown in FIG.7. The pixel definition layer 30 comprises pixel partitions 301 crossingeach other transversely and longitudinally and an opening 302 enclosedby the pixel partitions.

The L-shape baffle 11 and the strip-shape baffle 11′ (not shown in FIG.6) are located on a side of the pixel partition 301 away from the TFTback plate 10.

In this way, since the opening position 302 corresponds to the effectivedisplay region of each sub-pixel and the pixel partition 301 is locatedin the non-display region, when the baffle 11 is disposed on a side ofthe pixel partition 301 away from the TFT back plate, the shield by thebaffle 11 to the effective display region can be avoided, therebyreducing the influence on the display effect.

On the basis of this, in order to partition the cathode layer 20 bymeans of the L-shape baffle 11 and the strip-shape baffle 11′, forexample, the shape of the longitudinal section of the L-shape baffle 11and the strip-shape baffle 11′ is an inverted trapezoid as shown in FIG.6. The longitudinal section is perpendicular to the TFT back plate 10.In this way, when forming the cathode layer 20 on the substrate wherethe L-shape baffle 11 and the strip-shape baffle 11′ have been formed,for example, when forming a MgAg alloy film layer by using theevaporation process, under the cutting effect of the angle between thelong edge and the side edge of the L-shape baffle 11 and the strip-shapebaffle 11′, the cathode layer 20 can be disconnected, so as to form theself-capacitance electrode 201 within the touch region 102 defined bythe L-shape baffle 11 and the strip-shape baffle 11′, and form the touchlead 202 within the lead region 102 defined by the horizontal edges oftwo adjacent L-shape baffles 11.

It should be noted that the encapsulation cover plate 15 in the OLEDtouch display panel provided by the present application can be a coverplate glass or an encapsulation film layer. On the basis of this, inorder to improve the manufacturing effect of the encapsulation coverplate 15, the evenness of the surface of the OLED touch display panel isfurther improved. In an embodiment, the OLED touch display panel furthercomprises a plurality of spacers 110 located within the touch region 101as shown in FIG. 11. When the OLED touch display panel comprises thepixel definition layer 30, the spacer 110 can be located on a side ofthe pixel partition 301 of the pixel definition layer 30 away from theTFT back plate 10.

Because the spacer 110 is disposed within the touch region 101, thepositions of the spacer 110 and the baffle 11 do not overlap.

Based on this, in order to simplify the manufacturing process and formthe L-shape baffle 11 and the strip-shape baffle 11′ whose longitudinalsection is an inverted trapezoid, for example, the L-shape baffle 11 andthe strip-shape baffle 11′ are located in the same layer with thespacers 110 and comprise the same material with the spacers 110. Inaddition, the material of the L-shape baffle 11 and the strip-shapebaffle 11′ is negative photoresist. In such a case, the shapes oflongitudinal sections of the spacer 110 formed through a single maskexposure (MASK) process, the L-shape baffle 11 and the strip-shapebaffle 11′ are all inverted trapezoid.

In addition, when forming the cathode layer 20 on the substrate wherethe spacer 110, the L-shape baffle 11 and the strip-shape baffle 11′have been formed, for example, when forming a MgAg alloy film layerusing the evaporation process, under the cutting effect of the anglebetween the long edge and the side edge of the spacer 110, the L-shapebaffle 11 and the strip-shape baffle 11′, the cathode layer 20 can bedisconnected. At this time, the surfaces of the spacer 110, the L-shapebaffle 11 and the strip-shape baffle 11′ have a floating film layer.Because the film layer is in an island shape, it has less influence onthe OLED touch display panel.

On this basis, in order to reduce parasitic capacitances generatedbetween the self-capacitance electrodes 201 and other electrodes on theTFT back plate 10, the number of the spacers 110 within the touchregions 101 can be increased, and the arrangement of the spacers 110 canbe optimized.

Specifically, the spacers 110, as shown in FIG. 12 comprise a pluralityof first sub-spacers 110 a and a plurality of second sub-spacers 110 b.

The plurality of first sub-spacers 110 a is arranged in the form of amatrix. The second sub-spacers 110 b are located between two adjacentrows and two adjacent columns of first sub-spacers 110 a. An extendingdirection of the first sub-spacers 110 a is perpendicular to anextending direction of the second sub-spacers 110 b. In this way, morethin film layer in a floating state may be added within the touchregions 101 such that the area of the self-capacitance electrodes 201 isfurther reduced.

Based on the manufacturing process of the OLED touch display panel,after the spacer 110 on the pixel partition 301 of the pixel definitionlayer 30, the L-shape baffle 11 and the strip-shape baffle 11′ aremanufactured, before manufacturing the cathode layer 20, themanufacturing method of the OLED touch display panel further comprisesforming an organic material functional layer at least within the openingof the pixel definition layer 30.

Next, the specific structure of the organic material functional layerwill be illustrated.

For example, as shown in FIG. 13, the organic material functional layercomprises a hole injection layer (HI) 401, a hole transport layer (HT)402, a padding layer 405 for adjusting the height of the microcavity, abuffer layer (HTEB) 406 for increasing the transmission efficiency ofthe holes, an organic light emitting layer (EML) 403 and an electrontransport layer (ET) 404 located on a side of the TFT back plate 10close to the cathode layer 20 successively.

The hole injection layer 401, the hole transport layer 402, the bufferlayer 406 and the electron transport layer 404 cover the display of theTFT back plate 10 completely. The organic light emitting layer 403 andthe padding layer 405 correspond to the positions of the openings 302.

Specifically, the thicknesses of the hole injection layer 401 and thehole transport layer 402 are 50 Å and 1140 Å, respectively. Thethickness of the buffer layer 406 can be 100 Å. The thickness of theelectron transport layer 404 is 300 Å.

When the materials for forming the organic light emitting layer 403 aredifferent, under the excitation effect of an electric field formed bythe anode 21 and the cathode layer 20, different light rays can beemitted, including, for example, red light (R), green light (G) and bluelight (B). The red (R) organic light emitting layer 403, the green (G)organic light emitting layer 40 and the blue (B) organic light emittinglayer 403 have a thickness of 400 Å, 200 Å and 250 Å, respectively.

In addition, FIG. 14 is an illustration taking an example of theadjustment of the heights of the microcavities where the red (R) organiclight emitting layer 403 and the green (G) organic light emitting layer40 are located. When the height of the microcavity where the blue (B)organic light emitting layer 403 is located needs to be adjusted, thepadding layer 405 can be formed in an opening position corresponding tothe microcavity where the blue (B) organic light emitting layer 403 islocated. Specifically, the padding layers 405 for adjusting the heightsof the microcavities where the red (R) organic light emitting layer 403and the green (G) organic light emitting layer 40 are located have athickness of 730 Angstroms and 400 Angstroms, respectively.

As known from above, for the organic material functional layers havingthe above structure, only the organic light emitting layer 403 and thepadding layer 405 correspond to the position of the opening 302, and theremaining thin film layer all covers the display region of the TFT backplate 10. Therefore, the organic light emitting layer 403 and thepadding layer 405 can be formed by using a fine metal mask (FMM). Theremaining thin film layer can simply use an ordinary mask plate. As aresult, the number of FMMs can be reduced and the manufacture costs canbe lowered.

Alternatively, in the event that the manufacturing cost is acceptable,as shown in FIG. 14, the structure of the organic material functionallayer comprises a hole injection layer 401, a hole transport layer 402,a padding layer 405, a buffer layer 406, an organic light emitting layer403 and an electron transport layer 404 successively located on a sideof the TFT back plate 10 close to the cathode layer 20 and correspondingto the positions of the openings 302.

To sum up, because in the present application, as shown in FIG. 10, thetouch lead 202 and the self-capacitance electrode 201 are structures inthe same layer, no matter whether the structure of each OLED deviceitself is independent or not, the touch lead 202 can transmit signals tothe self-capacitance electrode 201, thereby enabling each OLED device tooperate normally. Therefore, the structures of the two organic materialfunctional layers provided by FIG. 13 and FIG. 14 are both applicablefor this scheme. Certainly, in order to simplify the manufacturingprocess and save the cost, for example, the manufacturing method asshown in FIG. 13 is adopted.

Based on that, after the organic material functional layer has beenmanufactured, a step of manufacturing the cathode layer 20 is executed.Moreover, a capping layer 407 can be further formed on the surface ofthe cathode layer 20 so as to improve the electric performance of thecathode layer 20. The capping layer 407 can have a thickness of 550

Angstroms.

An embodiment of this disclosure provides a touch display device,comprising the OLED touch display panel as stated above. It has the samebeneficial effect as the OLED touch display panel provided by thepreceding embodiments.

In addition, as shown in FIG. 3A, the touch display device furthercomprises driving components or driving circuits such as a FPC, a touchIC 14 and a driving IC 17 disposed in the non-display region of the OLEDtouch display panel.

It should be noted that in the present application, the touch displaydevice can be any product or component with the display function such asa television, a digital photo frame, a mobile phone or a tablet computeretc.

This disclosure provides an OLED touch display panel and a touch displaydevice. The OLED touch display panel comprises a TFT back plate and acathode layer disposed on the TFT back plate. The cathode layercomprises a plurality touch leads which are insulated from each otherand a plurality self-capacitance electrodes which are insulated fromeach other and arranged in a form of a matrix. The touch leads extend toa non-display region of the OLED touch display panel. Each touch lead isconnected with one self-capacitance electrode, and resistance values ofthe touch leads connected with the self-capacitance electrodes of a samerow are all consistent.

On the one hand, since the cathode layer comprises a plurality ofself-capacitance electrodes insulated from each other and arranged in aform of matrix, the cathode layer can be used as the self-capacitanceelectrodes. That is, when the OLED touch display panel is in a displayphase, a voltage is applied to the cathode layer such that the cathodelayer and an anode on the TFT back plate form an electric field, therebyexciting an organic light emitting layer located between the cathodelayer and the anode to emit light. When the OLED touch display panel isin a touch phase, each of the self-capacitance electrodes can beelectrically connected with a metal film layer in the non-display regionthrough the touch lead connected with it. The metal film layer isfurther connected with the ground end or a low voltage end, so as toenable the self-capacitance electrode to constitute self-capacitancewith the ground end or the low voltage end. When the plurality ofself-capacitance electrodes are arranged in the form of a matrix, N rowsand M columns of self-capacitance electrodes can be scanned so as todetermine a touch position according to coordinates of aself-capacitance whose capacitance value is changed. In this way, theIn-Cell touch structure of a simple structure can be achieved by usingthe cathode layer as the self-capacitance electrodes. Therefore, thesolution of forming a multi-layer thin film touch structure on an outerside of an encapsulation cover plate is not required, so the structureof the OLED touch display panel is simplified.

On the other hand, the metal film layer connects not only with theground end or the low voltage end of the non-display region, but alsowith a touch IC in the non-display region disposed on the FPC to outputthe signal collected by the touch lead to the touch IC. In such a case,since the resistance values of the touch leads connected with theself-capacitance electrodes of the same row are all consistent, theresistance values of the touch leads per se connected with theself-capacitance electrodes of the same row have the same influence tothe signal inputted by each touch lead to the self-capacitance electrodeconnected therewith and to the collected signal outputted to the touchIC, thus, by performing equal resistance design to the touch lead, theinfluence of the IR-drop phenomenon caused by lead resistance differenceon the display and touch performance of the OLED touch display panel canbe reduced.

The disclosure mentioned above is only specific embodiments of thisdisclosure, but the protection scope of this disclosure shall not belimited thereto. Any variation or substitution that can be easilyconceivable by the skilled person within the technical range disclosedin this disclosure shall fall within the protection scope of thisdisclosure. Therefore, the protection scope of this disclosure shall besubject to the protection scope of the claims.

1. An OLED touch display panel, comprising a TFT back plate and acathode layer disposed on the TFT back plate, wherein the cathode layercomprises a plurality of touch leads which are insulated from each otherand a plurality of self-capacitance electrodes which are insulated fromeach other and arranged in a form of a matrix, and the touch leadsextend to a non-display region of the OLED touch display panel; andwherein each of the touch leads is connected with one of theself-capacitance electrodes, and resistance values of the touch leadsconnected with the self-capacitance electrodes of a same row are allconsistent.
 2. The OLED touch display panel according to claim 1,wherein in a left half part of the OLED touch display panel, from leftto right, widths of touch leads connected with self-capacitanceelectrodes of a first column are the same as widths of touch leadsconnected with self-capacitance electrodes of a second column, andlengths of the touch leads connected with the self-capacitanceelectrodes of the first column are the same as lengths of the touchleads connected with the self-capacitance electrodes of the secondcolumn; and except for the self-capacitance electrodes of the firstcolumn, lengths and widths of touch leads connected withself-capacitance electrodes of other columns increase successively; andwherein in a right half part of the OLED touch display panel, from rightto left, widths of touch leads connected with self-capacitanceelectrodes of a first column are the same as widths of touch leadsconnected with self-capacitance electrodes of a second column, andlengths of the touch leads connected with the self-capacitanceelectrodes of the first column are the same as lengths of the touchleads connected with the self-capacitance electrodes of the secondcolumn; and except for the self-capacitance electrodes of the firstcolumn, lengths and widths of touch leads connected withself-capacitance electrodes of other columns increase successively. 3.The OLED touch display panel according to claim 1, wherein theself-capacitance electrode is in a rectangular shape; wherein in a lefthalf part of the OLED touch display panel, from left to right, areas ofthe self-capacitance electrodes increase gradually; and wherein in aright half part of the OLED touch display panel, from right to left,areas of the self-capacitance electrodes increase gradually.
 4. The OLEDtouch display panel according to claim 3, wherein in any one of the lefthalf part and the right half part of the OLED touch display panel, a sumof widths of touch leads connected with self-capacitance electrodes of asame row is less than or equal to 10% of a width of a self-capacitanceelectrode with the largest area in the same row; and wherein widthdirections of the touch leads and width directions of theself-capacitance electrodes are both perpendicular to extendingdirections of the touch leads.
 5. The OLED touch display panel accordingto claim 4, wherein in the left half part of the OLED touch displaypanel, from left to right, the widths of the touch leads connected withthe self-capacitance electrodes of the first column and the secondcolumn is the same as a width of a sub-pixel of the OLED touch displaypanel.
 6. The OLED touch display panel according to claim 4, wherein inthe right half part of the OLED touch display panel, from right to left,the widths of the touch leads connected with the self-capacitanceelectrodes of the first column and the second column is the same as awidth of a sub-pixel of the OLED touch display panel.
 7. The OLED touchdisplay panel according to claim 1, further comprising a plurality ofL-shape baffles disposed on the TFT back plate and a plurality ofstrip-shape baffles parallel to a horizontal edge of the L-shape baffle,wherein in a left half part of the OLED touch display panel, from leftto right, sizes of the plurality of L-shape baffles increasesuccessively, or in a right half part of the OLED touch display panel,from right to left, sizes of the plurality of L-shape baffles increasesuccessively.
 8. The OLED touch display panel according to claim 7,wherein vertical edges of two adjacent L-shape baffles are respectivelyconnected with two ends of one of the strip-shape baffles, the verticaledges of the two adjacent L-shape baffles and the one of the strip-shapebaffles define a touch region, and the horizontal edges of the twoadjacent L-shape baffles define a lead region connected with the touchregion.
 9. The OLED touch display panel according to claim 8, whereinthe L-shape baffles and the strip-shape baffles partition the cathodelayer into the self-capacitance electrodes located within the touchregions and the touch leads located within the lead regions.
 10. TheOLED touch display panel according to claim 7, wherein in the left halfpart of the OLED touch display panel, from left to right, or in theright half part of the OLED touch display panel, from right to left,opening directions of two adjacent L-shape baffles for defining thetouch region of the first column are arranged oppositely, and openingdirections of two adjacent L-shape baffles of other columns are thesame.
 11. The OLED touch display panel according to claim 10, whereinexcept for the touch regions of the first row, a horizontal edge of aninner-most L-shape baffle in a row for defining a touch region of aprevious row is shared by a strip-shape baffle for defining a touchregion of a next row.
 12. The OLED touch display panel according toclaim 7, further comprising a pixel definition layer disposed on the TFTback plate, wherein the pixel definition layer comprises pixelpartitions crossing each other transversely and longitudinally and anopening enclosed by the pixel partitions; and wherein the L-shape baffleand the strip-shape baffle are located on a side of the pixel partitionsaway from the TFT back plate.
 13. The OLED touch display panel accordingto claim 7, wherein shapes of longitudinal sections of the L-shapebaffle and the strip-shape baffle are inverted trapezoids, and thelongitudinal sections are perpendicular to the TFT back plate.
 14. TheOLED touch display panel according to claim 7, further comprisingspacers located within the touch region and disposed on the TFT backplate, wherein the L-shape baffle and the strip-shape baffle are locatedin a same layer with the spacers, and have a same material with thespacers, and the L-shape baffle and the strip-shape baffle are made ofnegative photoresist.
 15. The OLED touch display panel according toclaim 14, wherein the spacers comprise a plurality of first sub-spacersand a plurality of second sub-spacers; wherein the plurality of firstsub-spacers are arranged in a form of a matrix, and the secondsub-spacers are located between two adjacent rows and two adjacentcolumns of first sub-spacers; and wherein an extending direction of thefirst sub-spacers is perpendicular to an extending direction of thesecond sub-spacers.
 16. The OLED touch display panel according to claim12, further comprising an organic material functional layer, the organicmaterial functional layer comprises a hole injection layer, a holetransport layer, a padding layer, a buffer layer, an organic lightemitting layer and an electron transport layer successively located on aside of the TFT back plate close to the cathode layer; wherein the holeinjection layer, the hole transport layer, the buffer layer and theelectron transport layer completely cover a display region of the TFTback plate, and the organic light emitting layer and the padding layercorrespond to positions of the openings.
 17. The OLED touch displaypanel according to claim 12, further comprising an organic materialfunctional layer, the organic material functional layer comprising ahole injection layer, a hole transport layer, a padding layer, a bufferlayer, an organic light emitting layer and an electron transport layersuccessively located on a side of the TFT back plate close to thecathode layer and corresponding to positions of the openings.
 18. TheOLED touch display panel according to claim 1, wherein the cathode layercomprises at least one of metallic magnesium and metallic silver.
 19. Atouch display device, comprising the OLED touch display panel accordingto claim 1.